/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.polarrose.spring.bayeux.util;

import com.polarrose.spring.bayeux.BayeuxMessageHandler;
import com.polarrose.spring.bayeux.BayeuxFilter;

import java.lang.reflect.Type;
import java.lang.reflect.ParameterizedType;

/**
 * Utility methods used internally by the Spring/Bayeux framework.
 */

public class BayeuxUtil
{private BayeuxUtil() {
    }
    public static Class<?> getBayeuxMessageHandlerDataClass(BayeuxMessageHandler<?> handler)
    {
        Class[] interfaces = handler.getClass().getInterfaces();
        Type[] genericInterfaces = handler.getClass().getGenericInterfaces();

        for (int i = 0; i < interfaces.length; i++) {
            if (interfaces[i] == BayeuxMessageHandler.class && genericInterfaces[i] instanceof ParameterizedType) {
                ParameterizedType parameterizedType = (ParameterizedType) genericInterfaces[i];
                if (parameterizedType.getActualTypeArguments().length == 1) {
                    return (Class<?>) parameterizedType.getActualTypeArguments()[0];
                }
            }
        }

        return null;
    }

    public static Class<?> getBayeuxFilterDataClass(BayeuxFilter<?> filter)
    {
        Class[] interfaces = filter.getClass().getInterfaces();
        Type[] genericInterfaces = filter.getClass().getGenericInterfaces();

        for (int i = 0; i < interfaces.length; i++) {
            if (interfaces[i] == BayeuxFilter.class && genericInterfaces[i] instanceof ParameterizedType) {
                ParameterizedType parameterizedType = (ParameterizedType) genericInterfaces[i];
                if (parameterizedType.getActualTypeArguments().length == 1) {
                    return (Class<?>) parameterizedType.getActualTypeArguments()[0];
                }
            }
        }

        return null;
    }
}
